CN1853377A - Methods for transmitting closely-spaced packets in WLAN devices and systems - Google Patents

Abstract

A wireless local area network (WLAN) device transmits multiple data packets within a data burst. In various embodiments, after the first packet is transmitted, subsequent packets are transmitted before expiration of an Interframe Space (IFS). The subsequent packets may have a full-length preamble, a partial preamble or no preamble at all.

Description

In wlan device and system, transmit the method for little spacing grouping

Technical field

The present invention relates to wireless lan (wlan), relate in particular to the transmission of the grouping between the transmitter and receiver in WLAN.

Background

Support any wireless lan (wlan) equipment of electronics and the 802.1l of The Institution of Electrical Engineers (IEEE) standard (for example, ieee standard 802.11-1997,802.11a, 802.11e etc.) to comprise two major parts: 1) physics (PHY) layer signaling control appliance; And 2) media interviews control (MAC) equipment.The function of PHY equipment is to divide into groups by air interface transmission data.And the function of MAC equipment is to control the visit of sharing air interface liberally etc.

Minimum MAC agreement is made of two frames: 1) send to the frame of receiver from transmitter, and 2) affirmation (ACK) that correctly received from this frame of expression of receiver.Will send to receiver if transmitter has a plurality of groupings, then some release requirement transmitter of 802.11 standards is waited for ACK after the transmission of each grouping.In addition, transmitter must be waited for particular time interval after receiving ACK and before next grouping of emission, be called as frame pitch (IFS).

802.11 the grouping of other version of standard (for example, ieee standard 802.11e) selective affirmation of tenaculum transmits.This feature is called as " piece ACK ".Piece ACK feature makes transmitter next grouping can be sent to same receiver, and need not to wait for ACK.On the contrary, after the visit of having consulted air interface, transmitter sends first grouping, waits for IFS after first grouping finishes, and sends next grouping.After receiver had sent its all groupings, transmitter required response to receiver at transmitter, and response is the ACK of expression to the grouping of all previous emissions.

Although piece ACK feature provides the improvement of some throughput, yet the developer continues as the method for further raising throughput and wind scoop.Therefore, the needed further method and apparatus of the throughput of raising of burst mode that is to use.

The accompanying drawing summary

Appended claims has been pointed out different embodiments of the invention with details.Yet when considered in conjunction with the accompanying drawings, detailed description has presented more complete understanding of the present invention, and in institute's drawings attached, identical reference number refers to similar item:

Fig. 1 is the reduced graph according to the example WLAN of one embodiment of the present of invention;

Fig. 2 is the simplified block diagram according to the WLAN station of one embodiment of the present of invention;

Fig. 3 shows the example of the sequential chart that is used to launch a plurality of PHY protocol Data Units (PPDU) frame, and wherein each PPDU frame has single Service Data Unit (SDU);

Fig. 4 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of the PPDU that can comprise a plurality of SDU and delimiter;

Fig. 5 is according to one embodiment of the present of invention, is used for the flow chart of the process of transmitter assembling and emission PPDU as shown in Figure 4;

Fig. 6 is according to one embodiment of the present of invention, is used for the flow chart that receiver received and divided the process of PPDU as shown in Figure 4;

Fig. 7 shows according to one embodiment of the present of invention, emission have a plurality of SDU and not with get involved data the example of sequential chart of PPDU;

Fig. 8 is according to one embodiment of the present of invention, is used for the transmitter assembling and launches the flow chart of the process of all PPDU as shown in Figure 7;

Fig. 9 is according to one embodiment of the present of invention, is used for receiver and receives and divide the flow chart of the process of all PPDU as shown in Figure 7;

Figure 10 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of bursting of a plurality of PPDU;

Figure 11 is according to one embodiment of the present of invention, is used for the flow chart of the process of bursting of all a plurality of PPDU as shown in figure 10 of transmitter emission;

Figure 12 is according to one embodiment of the present of invention, is used for the flow chart that receiver receives the process of bursting of all a plurality of PPDU as shown in figure 10;

Figure 13 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of bursting of a plurality of PPDU of the intervention preamble that has brachymemma;

Figure 14 is according to one embodiment of the present of invention, is used for the flow chart of the process of bursting of all a plurality of PPDU as shown in figure 13 of transmitter emission;

Figure 15 is according to one embodiment of the present of invention, is used for the flow chart that receiver receives the process of bursting of all a plurality of PPDU as shown in figure 13;

Figure 16 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of bursting of not being with a plurality of PPDU that get involved preamble;

Figure 17 is according to one embodiment of the present of invention, is used for the flow chart of the process of bursting of all a plurality of PPDU as shown in figure 16 of transmitter emission; And

Figure 18 is according to one embodiment of the present of invention, is used for the flow chart that receiver receives the process of bursting of all a plurality of PPDU as shown in figure 16.

Describe in detail

In the description of following each embodiment, with reference to the accompanying drawings, accompanying drawing has formed a part of the present invention, and shows as an illustration wherein and can implement specific embodiments of the invention.Describe each embodiment with enough details, enabling those skilled in the art to implement the present invention, and be appreciated that and use other embodiment, and can make process or change mechanically, and do not depart from the scope of the present invention.These embodiment of the present invention can quote separately and/or jointly with term " the present invention " at this, only be for convenience's sake, and be not intended on the vocabulary scope of the present invention is limited to any single invention or inventive concepts (if in fact disclosing more than one).Can recognize that the method for each embodiment can make up simultaneously or one after the other when implementing.Various changes and combination will be conspicuous to those skilled in the art.

Embodiments of the invention comprise the method with a plurality of groupings of burst mode (that is adjoining land) emission.Each embodiment will describe in detail after will having described wireless lan (wlan) system and wlan device in conjunction with Fig. 1 and 2 hereinafter.Each embodiment can be such as realizing in system such as described system and equipment and the equipment in conjunction with Fig. 1 and 2.Each embodiment also can realize in other system with different configurations and equipment.

Fig. 1 is the reduced graph according to the example WLAN of one embodiment of the present of invention.WLAN can comprise a plurality of network stations 102 and zero or a plurality of access point (AP) 104.

In WLAN, the medium of the free space of network station 102 by being commonly referred to " air interface " is communicated by letter.Generally speaking, stand and 102 can be called as network adapter or network interface unit (NIC).Stand 102 can be that move, portable or static.For example, standing 102 can be laptop computer, hand-held radio, desktop computer or any other the unidirectional or bi-directional device that comes down to have the ability of communicating by letter with miscellaneous equipment 102 or AP 104 by wireless medium.

One group of station 102 can directly communicate with one another, as in the situation of basic service set (BSS).Independently BSS (IBSS) the 110th does not wherein arrive the BSS of any connection of cable network.

Foundation structure BSS 112 is that wherein BSS comprises the BSS of AP 104.In foundation structure BSS, communicate by letter with AP 104 in all stations 102.AP 104 provides the connection (if there is) of wired lan, and the local relay function that is used for BSS.Therefore, if first stop 102 wishes communicate by letter with second station 102, then first stop 102 is communicated by letter to AP 104 transmissions, and AP 104 with this communication repeating to second station 102.

Extended service set (ESS) 114 is one group of foundation structure BSS 112, and wherein AP 104 so that traffic is sent to another from a BSS 112, and is convenient to stand 102 from a BSS moving to another in communication between they itself.Distributed system (DS) is that an AP 104 is used for the mechanism of communicating by letter with another AP, to exchange among its BSS 112 from the frame at station 102, transmits frame following mobile radio station 102 from a BSS 112 to another, and with cable network (if there is) switching frame.

Now with the more detailed description embodiments of the invention.Although following use (for example is similar to IEEE 802.11 standards, ieee standard 802.11-1997,802.11a, 802.11e etc.) context in the term of the term that uses describe each embodiment in detail, yet the present invention and do not mean that to be limited in the system that uses IEEE 802.11 standards and use.On the contrary, embodiments of the invention also can use in conjunction with other wlan standard.

Fig. 2 is the simplified block diagram according to the WLAN station 200 (for example, the stations 102,104 of Fig. 1) of one embodiment of the present of invention.Support any WLAN station 200 of IEEE 802.11 standards to comprise physics (PHY) layer signaling control appliance 202 (PHY equipment), media interviews control (MAC) equipment 204 and MAC client computer 206.200 supports of WLAN station are provided by PHY equipment 202 and MAC equipment 204 and are served by the station that MAC client computer 206 is used.These services can comprise authentication, remove authentication, privacy and data passes.

206 establishments of MAC client computer and deal with data etc.The purpose of PHY and MAC equipment 202,204 is to guarantee that two network stations are using correct frame format and protocol communication.Ieee standard 802.11 has defined the communication protocol between PHY and the MAC equipment 202,204.

The function of PHY equipment 202 is three aspects: 1) exchange of the frame between MAC 204 and the PHY 202 is provided under physical layer convergence process (PLCP) control of substate; 2) under the control of relevant (PMD) sublayer of physical medium, send Frame by air interface; And 3) provide the carrier sense indication to MAC 204 conversely, make MAC 204 can verify the activity on the air interface.

PHY equipment 202 is realized in some physical layer specifications, such as infrared (IR) base band, frequency-hopping spread spectrum (FHSS), direct sequence spread spectrum (DSSS) or orthogonal frequency domain multiplexed (OFDM).Can realize other standard in other embodiments.

Generally speaking, PHY equipment 202 comprises PLCP device 210 and transmits and receives PMD device 212,214.These each can use or not use the whole of same physical circuit (for example, processor, bus, clock, storage etc.) or certain is a part of.In addition, one or more antenna 216 can interconnect with PMD device 212,214.When realizing the IR baseband specification, can use light-emitting diode (LED) (not shown) or other optics transfer equipment to replace antenna 216.

As mentioned above, the function of PLCP device 210 is the frame exchanges between control MAC equipment 204 and the PHY equipment 202.The function of PMD device 212,214 is control signal carrier wave and band spectrum modulation and demodulation, is used for by the air interface frame that transmits and receive data.

The structure of PMD device 212,214 depends on the specific physical layer specification of realizing in the station (for example, modulation type).For example, if used DSSS, then send PMD device 212 and can comprise scrambler, adder, mask filter and DBPSK DQPSK modulator, can comprise despreading correlator, DBPSK DQPSK demodulator, descrambler and timer clock restorer and receive PMD device 214.If used FHSS, then send PMD device 212 and can comprise data whitening device, symbol mapper, Gauss's shaping filter and modulator, can comprise that demodulator, data separate white noise device and frequency hopping timing recovery apparatus and receive PMD device 214.If used IR, then send PMD device 212 and can comprise symbol mapper, modulator and led driver, can comprise diode detector, demodulator and symbol mapper and receive PMD device 214.If used OFDM, then send PMD device 212 and can comprise convolution coder, bit interleave and mapped device, anti-fast Fourier transform (FFT), code element reshaper and quadrature amplitude modulation (qam) modulator, can comprise PSK qam demodulator, FFT, position release of an interleave and demapping device, convolutional decoder and clock recovery equipment and receive PMD device 214.

The function of MAC equipment 204 is to control visit to sharing air interface or the like.MAC equipment 204 provides the interface between MAC client computer 206 and the PHY equipment 202.In addition, encryption and decryption can be carried out or do not carried out to MAC equipment 204.In one embodiment, MAC equipment is supported the media access control sublayer according to ieee standard 802.11.In other embodiments, MAC equipment is supported the media access control sublayer according to another standard.

Because air interface has a lot of noises usually and is insecure, so ieee standard 802.11MAC equipment 204 achieve frame exchange agreements are determined with the source that allows Frame whether this frame is located in successfully in purpose and are received.Minimum MAC agreement is made of two frames: 1) transmit frame, and it comprises the frame that sends to receiver from transmitter; And 2) response is levied, and it comprises the affirmation (ACK) that the frame to being sent from receiver is correctly received.In addition, transmit frame may be one of following: confirm (ACK), send request (RTS), clear to send (CTS) or PS poll.The corresponding response frame respectively can be segmentation; CTS; Frame; And ACK.

Fig. 3 shows an example of the sequential chart that is used to send a plurality of PHY protocol Data Units (PPDU) frame, and each frame carries single Service Data Unit (SDU).The form of PPDU frame 300,310 expression frames when sending by air interface.In one embodiment, the PPDU frame comprises preamble 302, PHY header 304 and SDU 306.

Each of preamble 302, PHY header 304 and SDU 306 sends at the place that begins of symbol boundaries, as indicated by the time mark on the time shaft 320 of Fig. 3, each code element can have predetermined time duration, or the duration that changes in the different piece of grouping.For example, element duration can be 4 microseconds, although it also can be longer or shorter.

Preamble 302 comprises that receiver is used for the bit pattern of himself synchronously.Particularly, receiver can use preamble 302 to carry out following task: 1) grouping begins to gather; 2) channel estimating; 3) antenna diversity and training; 4) receiver automatic gain control (AGC); 5) carrier shift amount; And 6) symbol timing.

In one embodiment, in PHY header 304, be speed field and length/size field.The speed field indication must use the modulation of what type to receive the SDU 306 that imports into.In an alternative embodiment, the speed of importing SDU 306 into is to determine between transmission and receiving station in advance, and thus, rate information can not be included in the PHY header 304.

The length of length/size field indication SDU 306.In each embodiment, length/size field can comprise a plurality of bytes that send among SDU 306, the SDU 306 or the required some microseconds of a certain other value of indicating the length of SDU 306.PHY header 304 also can comprise verification and or other field, this makes its content to be identified.PHY header 304 can have fixing or length variable.

SDU 306 is a series of fields of being assembled and being delivered to by PLCP 210 PHY 202 by MAC 204 (Fig. 2).With regard to considering PHY 202, SDU 306 comprises " opaque data ", this means PHY 202 does not know or be indifferent to have comprised what data among the SDU 306.

SDU 306 can be a variable-length.The SDU frame can be used to transmit its Medium Access Control (MAC) Protocol Data Unit (MPDU) by MAC equipment 204, and it can comprise MPDU header, frame body field and Frame Check Sequence (FCS) field.Frame body field is a variable-length, and its content can be encrypted or not encrypted.This field can comprise all or part of of Medium Access Control (MAC) Service Data Unit (MSDU) from higher level protocol or protocol service data cell (PSDU).

Can use different modulation rates to send preamble 302, PHY header 304 and SDU 306.Preamble 302 and PHY header 304 are to send with the first rate that is called " robust modulation speed " herein.In one embodiment, the scope of robust modulation speed can be at about per second 6Mbps (megabit) to 12Mbps, although can use higher or lower speed in other embodiments.In one embodiment, robust modulation speed does not change.When robust modulation speed did not change, receiver was known and will be searched preamble 302 and PHY header 304 with known robust modulation speed.In another embodiment, robust modulation speed can change.In another embodiment, preamble 302 is to send with different modulation rates with PHY header 304.

As a comparison, SDU 306 can send with second speed that is called as " data modulation rates " herein.For purposes of illustration, SDU 306 usefulness cross-haulings are represented, indicate it to send with data modulation rates, and are opposite with robust modulation speed.

Data modulation rates can change between each frame.In one embodiment, this speed changes in about scope of 6 to 240Mbps.In one embodiment, receiver comes to be specific SDU specified data modulation rate by assessing as mentioned above the speed field of PHY header 304.

Lower modulation rate can be more healthy and stronger, this means the channel condition that the data tolerable is worse.Preamble 302 and PHY header 304 are to send with lower modulation rate, make that the data in the PHY header 304 can not be destroyed, are possible even given enough interfering signal powers destroy.For example, if the data in the speed field of PHY header 304 are destroyed, then receiver can't demodulation SDU 306.If the data in the size field of PHY header 304 are destroyed, receiver will block SDU 306 or prolong SDU 306, cause receiver demodulation SDU 306 terminal invalid datas afterwards.

The data modulation rates that is used for SDU 306 can be selected based on the estimation to channel condition.If channel is fabulous, then can select two-forty (for example) near 240Mbps, improved the throughput of system thus.If interchannel noise is very large, then can select relatively low speed (for example) near 6Mbps, make it possible to keep as much as possible data integrity.

In each embodiment, each grouping is completely or partially " self-described ", this means that receiver need not the prior information of the structure (that is, data rate and/or size) about grouping on the horizon.In one embodiment, each grouping is complete self-described, means that each is grouped in the PHY header 304 to comprise data modulation rates, and also comprises length/size information.In one embodiment, length/size information is included in the PHY header 304, and in another embodiment, this information is included among the SDU itself.

In another embodiment, each grouping is part self-described, this means that each grouping comprises length/size information, but can transmit and receive definition of data modulation rate between the station in the training exchange formerly.Therefore, data modulation rates needn't be included in the PHY header 304.

Should " self-described " feature with embodiments of the invention with make a distinction such as other agreements such as Hiperlan 2 agreements.Use Hiperlan 2 agreements, transmitter is every known data block of 2 milliseconds of emissions.This data block comprises that transmitter will be to the complete map of all the elements of the remainders of 2 milliseconds of time cycles on the horizon emission.This means that all receivers have the modulation rate of the grouping that will send about transmitter and the prior information of length.Use Hiperlan 2, modulation and length information are not included in each grouping, and grouping is not " self-described " thus.

As mentioned above, " burst mode " emission to the PPDU frame that has selective acknowledgement of " piece ACK " feature is used in the prior art systems support.Piece ACK feature makes transmitter to send next PPDU frame to same receiver, and need not to wait for ACK.On the contrary, after the visit of having consulted air interface, transmitter sends a PPDU frame, finishes the back in first grouping and waits for frame pitch (IFS), and send next PPDU frame.

Term " IFS " means and comprises various cycles correlation time as used herein, include but not limited to, IFS (EIFS) as the IFS that defines in IEEE 802.11 standards, short IFS (SIFS), priority IFS (PIFS), distributed I FS (DIFS) and expansion is not limited to the time cycle that only defines although term IFS means that in this standard.IFS can consume a plurality of symbol boundaries.Fig. 3 shows at four or the 2nd PPDU 310 that launches afterwards of the symbol-spaced 312 of multiple-symbol (can represent an IFS) more.IFS can be the symbol width of integer or non-integer number.In addition, the duration of IFS can be longer or shorter than four code elements.

Use piece ACK feature, after receiver had sent all its PPDU frames, transmitter required response to receiver at transmitter, and the response indication is to the ACK of the frame of all previous emissions.Use the method for prior art, each PPDU frame comprises single SDU, and each PPDU frame is formative as described in connection with Fig. 3 in essence.

According to various embodiments of the present invention, single PPDU frame comprise one or more opaque, the serial connection SDU, wherein one or more SDU are called as " payload " herein.In one embodiment, each SDU comprises one " delimiter ", the size of its indication SDU, and the PHY header can comprise length field, it comprises the whole length of the SDU of serial connection.In another embodiment, the PHY header comprises the length information of each SDU, thereby allows receiver assembling payload and it is repartitioned into different SDU.

In another embodiment, each PPDU frame comprises single SDU.Yet during burst mode, a plurality of PPDU frames are serially connected in together, but not wait for the IFS between each frame.In an embodiment again, a plurality of PPDU frames are serially connected in together, but each the PPDU frame after first frame is comprised a preamble that shortens.In also having an embodiment, a plurality of PPDU frames are serially connected in together, but each the PPDU frame after first frame has been eliminated preamble.To each embodiment be discussed in conjunction with Fig. 4-18 now.

Fig. 4 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of the PPDU that comprises a plurality of SDU and delimiter.The payload 406 that PPDU 400 comprises preamble 402, PHY header 404 and has the merging of at least one SDU 402,422 and 424.In the example shown, the payload 406 of merging comprises three SDU.Can in single payload, can comprise more or less SDU.

Preamble 402 comprises that receiver is used for the bit pattern of himself synchronously as mentioned above.PHY header 404 comprises speed field, and in one embodiment, which data modulation rates is the payload 406 that this field indication will be combined use.In one embodiment, PHY header 404 also comprises length/size field, and it has defined the total length of the payload 406 that merges.In each embodiment, length/size field can comprise a certain other value of the length of the payload 406 that byte number in the payload 406 of the required microsecond number of payload that emission merges 406, merging or indication merge.In another embodiment, PHY header 404 does not comprise total length information.PHY header 404 can have fixing or length variable.

Each SDU 420,422,424 must be separated by the PHY in the receiver and transmit intactly.Resolve into each SDU for ease of the payload 406 that will merge, the payload of merging also comprises each the information of length of a plurality of SDU of indication.In one embodiment, this information comprises a plurality of " delimiter " 408,410,412, wherein, in one embodiment, a delimiter is arranged before each SDU.

Each delimiter comprises length field, the variable-length 430,432,434 of the SDU 420,422,424 after it is indicated respectively.If back one SDU is not last SDU in the payload 406 that merges, then delimiter information also makes receiver can determine where to locate the delimiter of next SDU.

In one embodiment, each delimiter 408,410,412 comprises that also length confirms field, and it makes receiver can determine whether length field is destroyed, as hereinafter in greater detail.In one embodiment, length confirm field comprise verification and or CRC, although can use other confirmation in other embodiments.Length confirms that field allows healthy and strong error detection, as in conjunction with Fig. 5 and 6 in greater detail.

In addition, in one embodiment, each delimiter 408,410,412 also can comprise sequence field, and the SDU 420,422 and 424 after it is indicated respectively is that last SDU also is last SDU.In other embodiments, delimiter can comprise that length confirms any or both of field or sequence field.

In the above-described embodiments, between delimiter and SDU, there is man-to-man correlation.In another embodiment, between delimiter and SDU, may there be man-to-man correlation.On the contrary, can launch the delimiter number that is less than the SDU number.For example, can launch the single delimiter of all SDU length of indication.

Fig. 5 is according to one embodiment of the present of invention, is used for the transmitter assembling and launches the flow chart of the process of all PPDU as shown in Figure 4.This method is in frame 502 beginnings, and wherein PHY equipment obtains at least one SDU.In one embodiment, SDU is middle or be the destination with same receiver finally, although SDU also may have different destinations.

At frame 504, determine length and the length affirmation data of each SDU.For example, in one embodiment, SDU length is by two byte representations, and length confirms that field comprises verification and or the CRC to 2 byte length fields.Therefore, length confirms that field also can be 2 bytes.In other embodiments, length and/or length confirm that field can be greater or lesser.

In one embodiment, assemble the delimiter of each SDU at frame 506.Each delimiter comprises length field, length affirmation field and sequence field, and whether sequence field indication SDU is last.In other embodiments, delimiter can not comprise that length confirms any or both of field or sequence field.

In one embodiment, at frame 508 definite total lengths that will be included in the payload of the merging in the PHY header.Total length comprises that the length of each delimiter adds the length of each SDU.Total length makes receiver can determine when the end of the payload that merges occurs.In another embodiment, total length is not included in the PHY header.For example, in another embodiment, receiver can change the end that the sequence field that depends on delimiter is predicted the payload of merging into.As explaining in more detail, if delimiter is destroyed, then receiver can be measured the end that the code element energy has determined whether to arrive the payload that merges.

After the visit of having consulted air interface, at frame 510, transmitter is launched preamble and PHY header aloft with robust modulation speed.In one embodiment, transmitter begins to launch each preamble and PHY header at the section start of symbol boundaries.In one embodiment, the emission preamble reaches two code elements, and emission PHY header reaches a code element.In other embodiments, any that can launch preamble and PHY header reaches longer or shorter duration emission.

When having finished the emission of PHY header, at frame 502, transmitter switches to data modulation rates, and this speed will be used to launch the payload of merging.At frame 514, transmitter begins to launch first delimiter.In one embodiment, transmitter section start in next symbol boundaries after finishing the PHY header begins to launch first delimiter.Perhaps, first delimiter can begin in the time except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.In one embodiment, transmitter is launched the payload that merges in a symbol width of PHY header end.Internal block is filled the end that can be included in each SDU.

In one embodiment, delimiter can spend and be less than a code element and finish, and transmitter can the code element identical with delimiter than the rear section in launch SDU.In another embodiment, transmitter begins to launch SDU at next symbol boundaries place after finishing the delimiter emission.Internal block is filled the end that can be included in each SDU.

At frame 516, determine whether that also remaining more delimiter and SDU will launch.In another embodiment, can not comprise that this is definite.If also remaining more delimiter and SDU will launch, then at frame 514, transmitter begins the SDU that launches next delimiter and be associated.

In one embodiment, transmitter once the emission of finishing last SDU begin immediately to launch next the devise a stratagem delimiter, and no matter this moment whether appear on the symbol boundaries.In addition, transmitter begins to launch the SDU that is associated immediately once the emission of finishing delimiter.Therefore, in one embodiment, all data in the payload of merging all are serially connected effectively.In other embodiments, between follow-up delimiter and/or SDU, can there be spacing or padding data.After last SDU of emission, this method finishes.

Fig. 6 is according to one embodiment of the present of invention, is used for receiver and receives and divide the flow chart of the process of all PPDU as shown in Figure 4.This method is in frame 602 beginning, wherein the preamble that imports into the robust modulation rate detection of receiver.At frame 604, receiver uses this preamble, with the PPDu frame synchronization that becomes and import into.

In one embodiment, at frame 606, receiver is determined the modulation rate of payload of the merging of PPDU from the PHY header.In an alternative embodiment, data modulation rates can be determined between training commutation period formerly.

In one embodiment, receiver is also determined the whole length of the payload of merging from the PHY header.This makes receiver can know how long it should import data into the data modulation rates demodulation.In another embodiment, receiver uses length in the delimiter and sequence field to make this to determine, and needn't provide total length in the PHY header.In case finished the reception to the PHY header, at frame 608, receiver switches to data modulation rates and comes demodulation, conciliates blending payload also to receive.

In one embodiment, the first sample thing that appears in the payload of merging is a delimiter.Therefore, at frame 610, the data sementation that receiver receives and attempts to confirm to have the delimiter size.In one embodiment, the delimiter size is the size (for example, 2 bytes) that the size (for example, 2 bytes) of length field adds length affirmation field, and if comprise sequence field, then add its size (for example, 1 byte).In other embodiments, the absolute or relative size of various delimiter field can be different.

Be confirmed to be by determining that length confirms that field is whether relevant with data in the length field and carry out.In one embodiment, length confirm field comprise verification and or CRC, it makes receiver can determine that length data is destroyed or not destroyed.

At frame 612, determine whether the data sementation of delimiter size comprises the thing that appears to be effective delimiter.If then at frame 614, receiver receives also and stores the SDU data volume of its length as indicated in the delimiter length field, and this method advances to frame 622, and this will be described below.

If the segmentation of delimiter size does not comprise the thing that appears to be effective delimiter, then receiver is transferred to the delimiter search pattern, and this is by frame 616,618 and 620 indications.In this pattern, at frame 616, receiver has determined whether to arrive the end of payload.In each embodiment,,,, then can determine the end of payload if perhaps the code element energy is reduced to below the threshold value if perhaps arrived known end points if in a certain amount of time, do not detect delimiter.

If the end of no show payload, then at frame 618, receiver receives and assesses the data sementation of each follow-up delimiter size.Subsequent segment can be overlapping or order.

At frame 620, can be that length field and what can be that length is confirmed field by what is confirmed, determine whether the data sementation of next delimiter size appears to be possible delimiter.Be not possible delimiter if the data sementation of delimiter size seems, then process stores the data that receive repeatedly all the time as possible PDU.When detecting possible delimiter, receiver stops the delimiter search pattern.

At frame 622, determined whether to arrive the end of the payload that merges.In one embodiment, if the data volume corresponding to the total length field that provides in the PHY header is provided receiver, then it knows that it has arrived the end of the payload that merges.In another embodiment, if receiver has received in the end the data volume that is indicated as the length of last SDU in the delimiter, then it knows that it has arrived the end of the payload that merges.In one embodiment, receiver knows by the sequence field of the delimiter of last SDU of assessment whether SDU is last SDU of the payload of merging.In other embodiments, any or both of total length field in the PHY header or the sequence field in the delimiter can be do not comprised, and the another way of the end of determining the payload that merges can be used.For example, the receiver energy that can measure code element has determined whether to arrive the end of the payload that merges.

If the end of the payload that no show still merges, then this process as shown repeatedly.Particularly, receiver is in frame 610 next delimiter size data segmentation of assessment, and this process repeats.

If arrived the end of the payload that merges, then at frame 624, its each SDU of from the payload that merges, analyzing out of receiver transmission, and this method finishes.In another embodiment, receiver can transmit each SDU when receiving SDU, perhaps transmits SDU concurrently with other SDU of reception.

Above provide a kind of high-throughput method that has the burst mode emission of healthy and strong error detection and recovery in conjunction with the described embodiment of Fig. 4-6.By eliminating the IFS between the SDU, and by eliminating intervention preamble and the PHY header that is associated with the SDU of appearance after first SDU, improved throughput from the method for prior art.

Length confirms that field allows healthy and strong error detection and recovery.At first, length confirms that field makes receiver can confirm whether the length field in the delimiter is destroyed.If it is destroyed that receiver is determined length field, each byte after then receiver can be checked is to attempt to find out the data sementation that appears to be delimiter.If receiver is found out the data sementation that appears to be delimiter, then receiver is supposed this data representation delimiter, and receiver again synchronously himself to receive next SDU.

In one embodiment, the chance that receiver is found out the data sementation that appears to be delimiter is very faint, but is not impossible.In comprising the embodiment of 2 byte CRC, the chance that detects delimiter improperly approximately is 1/65000.Even this situation takes place, receiver also will be in not error detection once more when effective delimiter is found in the SDU end of supposition.And again, receiver appears to be search the data sementation of delimiter.Therefore, even delimiter is destroyed, and another data sementation seems delimiter by chance, and receiver finally also will recover when finding effective delimiter.Therefore, this embodiment provides the robust method of error detection and recovery.

In another embodiment, delimiter only comprises length field, and does not comprise length affirmation field.This embodiment work when channel is healthy and strong is good, and the length field of delimiter extremely can not be destroyed.If the data in the length field more may be destroyed, then lack length and confirm that field will make that receiver is more difficult and recover from length is confirmed mistake the field.Receiver can be searched next delimiter based on the length of destroying, and it may only find out data at random, and this can cause receiver even more difficultly recover from the data of mistake.

In in conjunction with the described embodiment of Fig. 6-8, send delimiter with data modulation rates.Although this can improve the delimiter length field ruined chance that becomes, delimiter length confirms that field allows healthy and strong error detection and recovery.

In the described embodiment in conjunction with Fig. 7-9, the PPDU frame can comprise a plurality of SDU, but the length of each SDU is included in the PHY header, and sends with robust modulation speed thus.In this embodiment, if the probability of the ruined chance of SDU length field less than the time with data modulation rates emission length.

Fig. 7 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of the PPDU that has a plurality of SDU that do not get involved data.PPDU 700 comprises preamble 702, PHY header 704 and the payload with merging of at least one SDU 706,716,726.In the example shown, the payload of merging comprises three SDU.Can in single payload, comprise more or less SDU.

Preamble 702 comprises that receiver is used for the bit pattern of himself synchronously as mentioned above.PHY header 704 comprises speed field, the payload which modulation rate it indicates be used to merge.PHY header 704 can have fixing or length variable.

Each SDU 706,716,716 must be received PHY in the machine and separate intactly and transmit.Resolve into other SDU for ease of the payload that will merge, in one embodiment, PHY header 704 also comprises the length/size field that is associated with each SDU 706,716 and 726 in the payload that is included in merging.

In one embodiment, each length/size field is indicated the length of its SDU that is associated.In another embodiment, length/size field has defined the combined length of the SDU that is associated in the payload that merges and any leading SDU.Thus, the length of SDU 706 can be represented as the length 730 of SDU 706.The length of SDU 716 can be represented as the combined length 732 of SDU 706 and 716.At last, the length of SDU 276 can be represented as the combined length 734 of SDU 706,716 and 726.In each embodiment, length/size field can comprise a certain other value of microsecond number, byte number or indicating length.

Value in length/size field makes receiver can determine when a SDU finishes and when another begins.Therefore, in another embodiment, length/size field can change into and comprise " side-play amount " value, and its indication is to the size of the side-play amount of the payload of the merging of beginning that next SDU wherein occurs (or wherein occur last SDU end).

Fig. 8 shows according to one embodiment of the present of invention, is used for the transmitter assembling and launches the flow chart of the process of all PPDU as shown in Figure 7.This method is in frame 802 beginnings, and wherein PHY equipment obtains at least one SDU.In one embodiment, SDU is middle or be the destination with same receiver finally, although SDU may have different destinations.

At frame 804, determine the length (or side-play amount) that is associated with each SDU.Length can be the independent length of each SDU, or the combined length of each SDU in the payload that merges.For example, in one embodiment, SDU length is represented by two bytes.In other embodiments, length field can be greater or lesser.In another embodiment, offset value can be used to allow to determine the end of a SDU and the beginning of next SDU, but not use length value.

Each length or side-play amount are included in the PHY header.Therefore, if the payload that merges comprises three SDU, then the PHY header will comprise at least three length fields.In one embodiment, the PHY header is a fixed size, and it has limited the number of the describable SDU of PHY header.In another embodiment, the PHY header has variable size.In this embodiment, the PHY header can comprise allow to determine that the PHY header described the information of the length of how many SDU and/or PHY header.

After the visit of having consulted air interface, at frame 806, transmitter is launched preamble and PHY header aloft with robust modulation speed.In one embodiment, transmitter begins to launch each of preamble and PHY header at the section start of symbol boundaries.In one embodiment, the emission preamble reaches two code elements, and emission PHY header reaches a code element.In other embodiments, can launch preamble or the PHY header reaches the longer or shorter duration.

When finishing the emission of PHY header, at frame 808, transmitter switches to data modulation rates.Transmitter begins to launch a SDU at frame 810.In one embodiment, transmitter section start in next symbol boundaries after finishing the PHY header begins to launch a SDU.Perhaps, a SDU can begin in the moment except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.In one embodiment, transmitter begins to launch the payload of merging in the width of a code element of the end of PHY header.Internal block is filled the end that can be included in each SDU.

At frame 812, determine whether that also remaining more SDU will launch.If also remaining more SDU will launch, then transmitter begins to launch next SDU at frame 810.In one embodiment, transmitter begins to launch next SDU immediately once the emission of finishing last SDU, no matter and whether this position in the payload appears on the symbol boundaries.Therefore, in this embodiment, all data in the payload of merging all are serially connected effectively.In other embodiments, between follow-up SDU, can there be spacing or padding data.After having launched last SDU, this method finishes.

Fig. 9 is according to one embodiment of the present of invention, is used for receiver and receives and divide the flow chart of the process of all PPDU as shown in Figure 7.This method is in frame 902 beginning, wherein the preamble that imports into the robust modulation rate detection of receiver.At frame 904, receiver is received the PPDU frame synchronization of preamble to become and to import into.

In one embodiment, at frame 906, the modulation rate of receiver payload of the merging of definite PPDU from the PHY header.In an alternative embodiment, data modulation rates can be determined in the training exchange formerly.

In one embodiment, receiver length or side-play amount that also each SDU definite and in the payload that merges is associated from the PHY header.This makes receiver can know that the SDU border occurs wherein, and how long it should import data into the data modulation rates demodulation.In case finished the reception to the PHY header, receiver just switches to the data modulation rates demodulation at frame 908.

At frame 910, receiver receives and stores the SDU data that its length is quantity indicated in the associated length field of the SDU in the PHY header.At frame 912, determined whether to arrive the end of the payload that merges.In one embodiment, if the quantity data corresponding to the length field of last SDU that provides in the PHY header is provided receiver, then receiver knows that it has arrived the end of the payload that merges, no matter and this length field is the length of indicating last SDU individually, or this length field indication combined length.In an additional embodiments, receiver can use the measurement of code element energy to determine to have arrived the end of payload.

If the end of the payload that no show still merges, then process as shown repeatedly.Particularly, receiver receives and stores next SDU at frame 910, and this process repeats.

If arrived the end of the payload that merges, then at frame 914, it analyzes each SDU of coming out the receiver transmission from the payload that merges, and this method finishes.In another embodiment, receiver can transmit each SDU when receiving SDU, perhaps transmits each SDU concurrently with other SDU of reception.

In in conjunction with the described embodiment of Fig. 7-9, between SDU, do not launch preamble or PHY header.Therefore, when receiver received the payload that merges, receiver need not to switch back and forth between data modulation rates and robust modulation speed.In in conjunction with another embodiment shown in Figure 10-12, each SDU is sent preamble and PHY header.Yet transmitter is in the middle of the emission or final do not wait for IFS before with same receiver being the follow-up PPDU frame of destination.On the contrary, transmitter begins to launch next PPDU at next symbol boundaries place after finishing former frame.

Figure 10 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of a plurality of PPDU.Each PPDU 1000,1010,1020 comprises preamble 1002,1012,1022, PHY header 1004,1014,1024, and SDU 1006,1016,1026.In the example shown, show the PPDU of three serial connections.According to sending more or less PPDU in conjunction with the described embodiment of Figure 10-12.

Each preamble 1002,1012,1022 comprises that receiver is used for the bit pattern of himself synchronously as mentioned above.Each PHY header 1004,1014,1024 comprises speed field, and which data modulation rates its indication uses to payload.Data modulation rates can be identical or different to each payload.In addition, each PHY header 1004,1014,1024 comprises length/size field of the SDU 1006,1016,1026 that follows thereafter.The length of payload can be identical or different.In one embodiment, each length/size field is indicated the length of its SDU that is associated.In each embodiment, length/size field can comprise a certain other value of microsecond number, byte number or indicating length.PHY header 1004 can have fixing or variable-length.

Figure 11 is according to one embodiment of the present of invention, is used for the flow chart of the process of bursting of all a plurality of PPDU as shown in figure 10 of transmitter emission.This method is in frame 1102 beginnings, and wherein PHY equipment obtains at least one SDU.In one embodiment, SDU is middle or be the destination with same receiver finally, although SDU may have different destinations.

At frame 1104, determine the length that is associated with next SDU that will launch.For example, in one embodiment, SDU length is by two byte representations.In other embodiments, length field can be greater or lesser.Length is included in the PHY header to this SDU.

After the visit of having consulted air interface, transmitter is launched preamble and the PHY header of SDU aloft with robust modulation speed at frame 1106.In one embodiment, transmitter begins to launch each preamble and PHY header at the section start of symbol boundaries.In one embodiment, the emission preamble reaches two code elements, and emission PHY header reaches a code element.In other embodiments, can launch preamble or the PHY header reaches the longer or shorter duration.

When having finished the emission of PHY header, transmitter switches to data modulation rates at frame 1108.Transmitter begins to launch a SDU at frame 11 10.In one embodiment, transmitter begins to launch a SDU at next symbol boundaries place after finishing the PHY header.Perhaps, a SDU can begin in the moment except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.Although not shown in Figure 11, yet last code element of wherein launching SDU may only partly be used.In this case, there is spacing between terminal and next symbol boundaries of SDU initial.In addition, internal block is filled the end that can be included in each SDU.

At frame 1112, determine whether that also remaining more SDU will launch.If also remaining more SDU will launch, then process as shown repeatedly.Particularly, transmitter is prepared and is launched next preamble, PHY header and SDU.

In one embodiment, transmitter begins to launch the preamble of next PPDU at the section start of next symbol boundaries after finishing last SDU.Perhaps, next PPDU can begin in the time except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.After last SDU of emission, this method finishes.

Figure 12 is according to one embodiment of the present of invention, is used for the flow chart that receiver receives the process of bursting of all a plurality of PPDU as shown in figure 10.This method is in frame 1202 beginning, wherein the preamble that imports into the robust modulation rate detection of receiver.At frame 1204, receiver uses the PPDU frame synchronization of this preamble to become and to import into.

In one embodiment, at frame 1206, receiver is determined the modulation rate of the payload of PPDU from the PHY header.In another embodiment, data modulation rates can be determined between training commutation period formerly.

In one embodiment, receiver is also determined the length of the SDU that is associated from the PHY header.In case finished the reception to the PHY header, receiver switches to data modulation rates at frame 1208 and comes demodulation.

At frame 1210, receiver receives and stores the SDU data that its length is the indicated quantity of the associated length field of the SDU in the PHY header.In an alternative embodiment, receiver can use the measurement of code element energy to determine whether to arrive the end of payload.

When arriving SDU terminal, at frame 1212, receiver transmits SDU.In another embodiment, receiver can begin to transmit SDU when receiving SDU.This process attempts to come as shown repeatedly with robust modulation rate detection preamble at frame 1202 by receiver then.

In in conjunction with the described embodiment of Figure 10-12, between SDU, launched the preamble and the PHY header of total length.In in conjunction with another embodiment shown in Figure 13-15, to the preamble of PPDU frame emission total length, and to subsequent P PDU frame radiating portion preamble.

Figure 13 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of bursting of a plurality of PPDU of the intervention preamble with shortening.In one embodiment, a PPDU 1300 comprises total length preamble 1302, and the follow- up PPDU 1310,1320 in bursting comprises part preamble 1312,1322.

Total length preamble 1302 comprises that receiver is used for the bit pattern of himself synchronously.Particularly, receiver can use preamble 1302 to carry out following task: the initial collection of 1) dividing into groups; 2) channel estimating; 3) antenna diversity and training; 4) receiver automatic gain control (AGC); 5) carrier shift amount; And 6) symbol timing.In one embodiment, can begin the place and carry out once bursting except that grouping all these tasks the initial collection.For the follow-up PPDU after first PPDU that bursts, radiating portion preamble 1312,1322.Part preamble 1312,1322 can be used for carrying out the initial acquisition tasks of grouping by receiver.

In one embodiment, each PPDU 1300,1310,1320 also comprises PHY header 1304,1413,1324 and SDU 1306,1316,1326.In one embodiment, each PHY header 1304,1314,1324 comprises speed field, and which data modulation rates its indication will use to payload.In another embodiment, data modulation rates can be determined between the training commutation period.

In addition, each PHY header 1304,1314,1324 comprises length/size field of the SDU 1306,1316,1326 that follows thereafter.In one embodiment, each length/size field is indicated the length of its SDU that is associated.In each embodiment, length/size field can comprise a certain other value of microsecond number, byte number or indicating length.In described example, show the PPDU of three serial connections.According in conjunction with the embodiment shown in Figure 13-15, can send more or less PPDU.PHY header 1304 can have fixing or length variable.

Figure 14 is according to one embodiment of the present of invention, is used for the flow chart of the process of bursting of all a plurality of PPDU as shown in figure 13 of transmitter emission.This method is in frame 1402 beginnings, and wherein PHY equipment obtains at least one SDU.In one embodiment, SDU is middle or be the destination with same receiver finally, although SDU may have different destinations.

At frame 1404, determine the length that is associated with next SDU that will launch.For example, in one embodiment, SDU length is by 2 byte representations.In other embodiments, length field can be longer or shorter.Length is included in the PHY header of this SDU.

After the visit of having consulted air interface, transmitter is launched total length preamble and the PHY header of SDU aloft with robust modulation speed at frame 1406.In one embodiment, transmitter sends each total length preamble and PHY header at the section start of symbol boundaries.In one embodiment, emission total length preamble reaches two code elements, and emission PHY header reaches a code element.In other embodiments, can launch the total length preamble or the PHY header reaches the longer or shorter duration.

When the emission finished the PHY header, transmitter switches to data modulation rates at frame 1408.Transmitter begins to launch a SDU at frame 1410.In one embodiment, transmitter section start in next symbol boundaries after finishing the PHY header begins to launch a SDU.Perhaps, a SDU can be in the place's beginning of the time except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.Although not shown in Figure 14, wherein launch last code element of SDU and may only partly be used.In this case, there is spacing at SDU between terminal and next symbol boundaries initial.In addition, internal block is filled the end that can be included in each SDU.

At frame 1412, transmitter switches back robust modulation speed, makes it can easily launch next preamble.At frame 1414, determine whether that also remaining more SDU will launch.In another embodiment, can not comprise that this is definite.If also remaining more SDU will launch, then transmitter is in the length of frame 1416 definite next SDU that will launch.

At frame 1418, transmitter begins to launch part preamble and the PHY header of SDU aloft with robust modulation speed.In one embodiment, the radiating portion preamble reaches a code element, and emission PHY header reaches a code element.In other embodiments, but radiating portion preamble or PHY header reach the longer or shorter duration.In one embodiment, transmitter begins to launch the part preamble of next PPDU at the section start of next symbol boundaries after finishing last SDU.Perhaps, next PPDU can begin in the time except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.

After having launched part preamble and PHY header, this method as shown repeatedly.Particularly, transmitter switches back data modulation rates, and launches next SDU.After all SDU that launched in bursting, this method finishes.

Figure 15 is according to one embodiment of the present of invention, is used for the flow chart that receiver receives the process of bursting of all a plurality of PPDU as shown in figure 13.This method is in frame 1502 beginning, wherein the total length preamble that imports into the robust modulation rate detection of receiver.Receiver uses this preamble synchronous fully with the PPDU frame that becomes and import at frame 1504.As described earlier, comprise following task fully synchronously: the initial collection of 1) dividing into groups; 2) channel estimating; 3) antenna diversity and training; 4) receiver automatic gain control (AGC); 5) carrier shift amount; And 6) symbol timing.In other embodiments, in complete synchronizing process, can carry out more, still less or different tasks.

In one embodiment, receiver is in the modulation rate of frame 1506 payload of definite PPDU from the PHY header.In another embodiment, specified data modulation rate between can training commutation period formerly.

In one embodiment, receiver is also determined the length of the SDU that is associated from the PHY header.In case finished the reception to the PHY header, receiver switches to the data modulation rates demodulation at frame 1508.

At frame 1510, receiver receives and stores the SDU data of the indicated quantity of the associated length field of the SDU in its length such as the PHY header.In an alternative embodiment, receiver can use the measurement of code element energy to determine whether to arrive the end of payload.

When having arrived SDU terminal, receiver switches back robust modulation speed at frame 1512, makes it can easily receive the preamble that next imports into.In addition, at frame 1514, receiver transmits SDU.In another embodiment, receiver can begin to transmit SDU when receiving SDU.

After the reception of finishing a SDU, receiver determines whether to detect the part preamble at frame 1516.If do not detect the part preamble in a certain amount of time, then receiver can be supposed to burst and finishes, and this process finishes.

If detect the part preamble, then at frame 1518, receiver uses this part preamble to come the operating part synchronizing process.In one embodiment, this relates to the task of carrying out the initial collection of grouping at least.Owing to need not at least one of other previous synchronous task of carrying out of repetition, so receiver will spend the time of much less and the PPDU that imports into is synchronous, and the part preamble can be wanted much shorter than total length preamble.In other embodiments, the part preamble can be used for carrying out more or other task by receiver.Partly synchronously after himself, at frame 1518, this process as shown repeatedly.Particularly, PHY header and the SDU of the PPDU that is associated with the part preamble of receiver reception and processing.

In in conjunction with the described embodiment of Figure 13-15, radiating portion preamble and PHY header between SDU.In in conjunction with another embodiment shown in Figure 16-18, between SDU, only launch the PHY header, and do not comprise the preamble of intervention.Although preamble is helpful when carrying out the task of the initial collection of grouping, but in one embodiment, may even also may collect after having lost structural information the initial of grouping by entering PHY header search pattern, PHY header search pattern will be hereinafter in conjunction with Figure 18 more detailed description.Therefore, even between SDU, there is not the preamble got involved, acceptable synchronously, to recover also be possible for error detection and makeing mistakes.

Figure 16 shows according to one embodiment of the present of invention, is used to launch the example of the sequential chart of bursting of a plurality of PPDU of the preamble of not being with intervention.The one PPDU 1600 comprises preamble 1602.Preamble 1602 comprises that receiver is used for the bit pattern of himself synchronously.In one embodiment, burst in subsequent P PDU 1610,1620 do not comprise preamble.

In one embodiment, each PPDU 1600,1610,1620 comprises PHY header 1604,1614,1624, and SDU 1606,1616,1626.In one embodiment, each PHY header 1604,1614,1624 comprises speed field, and which data modulation rates its indication will use to payload.In another embodiment, data modulation rates can be determined between the training commutation period.

In addition, each PHY header 1604,1614,1624 comprises length/size field of the SDU 1606,1616,1626 that follows thereafter.In one embodiment, each length/size field is indicated the length of its SDU that is associated.Therefore, length/size field makes receiver can determine when the end of SDU occurs, and predicts when the initial of next PHY header in bursting occurs.In each embodiment, length/size field can comprise a certain other value of microsecond number, byte number or indicating length.In the example shown, show the PPDU of three serial connections.According to sending more or less PPDU in conjunction with the described embodiment of Figure 16-18.PHY header 1604 can have fixing or length variable.

Figure 17 is according to one embodiment of the present of invention, is used for the flow chart of the process of bursting of all a plurality of PPDU as shown in figure 16 of transmitter emission.This method is in frame 1702 beginnings, and wherein PHY equipment obtains at least one SDU.In one embodiment, SDU is middle or be the destination with same receiver finally, although SDU may have different destinations.

At frame 1704, determine the length that is associated with a SDU that will launch.For example, in one embodiment, SDU length is by two byte representations.In other embodiments, length field can be longer or shorter.Length is included in the PHY header of this SDU.

After the visit of having consulted air interface, at frame 1706, transmitter is launched preamble and the PHY header of SDU aloft with robust modulation speed.In one embodiment, transmitter begins to launch each preamble and PHY header at the section start of symbol boundaries.In one embodiment, the emission preamble reaches two code elements, and emission PHY header reaches a code element.In other embodiments, can launch preamble or the PHY header reaches the longer or shorter duration.

When finishing the emission of PHY header, transmitter switches to data modulation rates at frame 1708.Transmitter begins to launch a SDU at frame 1710.In one embodiment, transmitter section start in next symbol boundaries after finishing the PHY header begins to launch a SDU.Perhaps, a SDU can begin in the time except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.Although not shown in Figure 17, wherein launch last code element of SDU and may only partly be used.In this case, between the section start of terminal and next symbol boundaries of SDU, there is spacing.In addition, internal block is filled the end that can be included in each SDU.

At frame 1712, transmitter switches to robust modulation speed, makes it can easily launch next PHY header.At frame 1714, determine whether that also remaining more SDU will launch.In another embodiment, can not comprise and thisly determining.If also remaining more SDU will launch, then transmitter is in the length of frame 1716 definite next SDU that will launch.

At frame 1718, transmitter begins to launch the PHY header of SDU aloft with robust modulation speed.In one embodiment, emission PHY header reaches a code element.In other embodiments, can launch the PHY header and reach the longer or shorter duration.In one embodiment, transmitter begins to launch the PHY header of next PPDU at the section start of next symbol boundaries after having finished last SDU.Perhaps, next PPDU can begin in the time except that symbol boundaries.In other words, emission can begin before or after symbol boundaries.

After having launched the PHY header, this method as shown repeatedly.Particularly, data modulation rates is switched back in emission, and launches next SDU.After all SDU that launched in bursting, this method finishes.

Figure 18 is according to one embodiment of the present of invention, is used for the flow chart that receiver receives the process of bursting of all a plurality of PPDU as shown in figure 16.This method is in frame 1802 beginning, wherein the preamble that imports into the robust modulation rate detection of receiver.At frame 1804, receiver uses the PPDU frame synchronization of this preamble to become and to import into.

Next symbol boundaries place after preamble finishes, receiver should begin to receive the PHY header.Therefore, the receiver data sementation that receives and attempt to confirm to have the PHY header size.In one embodiment, the PHY header size is that a code element is wide.

Be confirmed to be by determining that data integrity field in the PHY header is whether relevant with data in the PHY header and carry out.In one embodiment, the data integrity field comprise verification and or CRC, it makes that receiver can specified data be destroyed or not destroyed.

At frame 1806, determine whether the data sementation of PHY header size comprises the thing that appears to be effective PHY header.If not, then receiver is transferred to by frame 1808,1810 and the 1812 PHY header search patterns of representing.In this pattern, receiver determines whether to arrive the end of bursting at frame 1808.In each embodiment,,,, then determine to arrive the end of bursting if perhaps the code element energy is reduced to below the threshold value if perhaps arrived known end points if in a certain amount of time, do not detect the PHY header.If arrived the end of bursting, then this method finishes.

If the end that no show is burst, then receiver receives and assesses the data sementation of each subsequent P HY header size then at frame 1810.Follow-up segmentation can be overlapping or order.

At frame 1812, be header data by what is confirmed, what is that the header integrity field determines whether the data sementation of next PHY header size appears to be possible PHY header.If the data sementation of PHY header size does not appear to be possible PHY header, then this process repeatedly.When detecting possible PHY header, receiver stops PHY header search pattern.

When withdrawing from PHY header search pattern, maybe when having confirmed next PHY header, in one embodiment, at frame 1814, receiver is determined the modulation rate of the payload of PPDU from the PHY header.In another embodiment, data modulation rates can be determined between training commutation period formerly.

In one embodiment, receiver is also determined the length of the SDU that is associated from the PHY header.In case finished the reception to the PHY header, at frame 1816, receiver switches to the data modulation rates demodulation.

At frame 1818, receiver receives and stores the SDU data of the indicated quantity of the associated length field of the SDU in its length such as the PHY header.In an alternative embodiment, receiver can use the measurement of code element energy to determine to arrive the end of payload.

When arriving the SDU end, at frame 1820, receiver switches gets back to robust modulation speed, makes it can easily receive the PHY header that next imports into.In addition, at frame 1822, receiver transmits SDU.In another embodiment, receiver can begin to transmit SDU when receiving SDU.

After the reception of having finished a SDU, receiver has determined whether to occur the end of bursting at frame 1824.If do not detect the PHY header in a certain amount of time, if perhaps arrived known end points, if perhaps the code element energy is reduced to below the threshold value, then receiver can be supposed to have finished and bursts, and this process finishes.If detect the PHY header, then this process as shown repeatedly.Particularly, receiver receives and handles PHY header and the SDU of next PPDU.

The high-throughput method of the burst mode transmission with healthy and strong error detection and recovery above is provided in conjunction with the described embodiment of Figure 16-18.By eliminating IFS and the preamble between the SDU, improved throughput from the method for prior art.

The header integrity field of PHY header allows healthy and strong error detection and recovery.If it is destroyed that receiver is determined the PHY data, this can indicate asynchronous condition, and then receiver can be checked each byte then, to attempt to find out the data sementation that appears to be the PHY header.If receiver finds the data sementation that appears to be the PHY header, then receiver is supposed this data representation PHY header, and receiver himself receives next SDU again synchronously.

Each embodiment of the methods, devices and systems that allow the transmission of high throughput data burst has been described thus.More than the description of specific embodiment has fully been represented general characteristic of the present invention, other people can come easily to revise for various application and/or change it by using existing knowledge, and do not break away from this universal.Therefore, these changes and modification fall within the meaning and scope of equivalence techniques scheme of the disclosed embodiments.Word that adopt in this place or term are used for purpose of description and unrestricted.Therefore, main body of the present invention comprises spirit and interior all such changes, modification, equivalence techniques scheme and the variation of broad range that falls into appended claims.

Above can be by carrying out with disclosed different order with respect to method the operation described shown here and that describe.Be described to have " end " although also be appreciated that some method at this, they also can be carried out continuously.

Although above in conjunction with 802.11 standard to describe each embodiment, yet each embodiment can realize in conjunction with other standard that has wholly or in part " self-described " frame.In other words, each embodiment and be not intended to method, system and the equipment that is limited to 802.11 standards that realize.

Various process described herein can realize with hardware, firmware or software.Software realizes using microcode, assembler language code or higher-level language code more.Code the term of execution or constantly can be stored in one or more volatibility or the non-volatile computer-readable medium at other.These computer-readable mediums can comprise hard disk, moveable magnetic disc, removable CD, cassette, flash card, digital video disc, Bei Nuli cassette tape, random-access memory (ram), read-only memory (ROM) or the like.

Embodiments of the invention can relate to any in various types of PHY layers of supporting ieee standard 802.11 and other wlan standard, other wlan standard includes but not limited to, infrared (IR) base band PHY, frequency-hopping spread spectrum (FHSS) radio are (for example, in the 2.4GHz frequency band), direct sequence spread spectrum (DSSS) radio (for example, in the 2.4GHz frequency band), orthogonal frequency domain multiplexed (OFDM) radio (for example, in the UNII frequency band) and it is expanded the PHY layer of other type of ieee standard 802.11 and other wlan standard the present and the future.In addition, embodiments of the invention can use in conjunction with any ieee standard 802.11, comprise ieee standard 802.11-1997,802.11a, 8021.11b, 802.11e, existing or present or other variant of the ieee standard 802.11 that developing future and other wlan standard except that ieee standard 802.11.

In appended claims, term " first modulation rate ", " second modulation rate " and " the 3rd modulation rate " have been used.Any that is appreciated that these modulation rates can be same to each other or different to each other.

Claims (51)

1. method comprises:

By air interface transmission first protocol Data Unit, described first protocol Data Unit comprises:

First preamble, it makes that receiver can be synchronous, and launches with first modulation rate;

First header, it is after described first preamble, and with the emission of described first modulation rate; And

First Service Data Unit, it and is launched with second modulation rate after described first header; And

Before frame pitch ends by described air interface transmission second protocol Data Unit.

2. the method for claim 1 is characterized in that, launches described second protocol Data Unit and begins about next symbol boundaries place greatly after described first protocol Data Unit of emission finishes.

3. the method for claim 1 is characterized in that, described second protocol Data Unit comprises:

Second preamble, it is launched with described first modulation rate;

Second header, it is after described second preamble, and with the emission of described first modulation rate; And

Second Service Data Unit, it and is launched with the 3rd modulation rate after described second header.

4. method as claimed in claim 3 is characterized in that, described first preamble comprises the total length preamble, and wherein, described second preamble comprises the part preamble.

5. method as claimed in claim 4 is characterized in that, the width of about two code elements of the described first preamble consumption, and wherein, the width of the about code element of the described second preamble consumption.

6. the method for claim 1 is characterized in that, described second protocol Data Unit comprises:

Second header, it is launched with described first modulation rate; And

Second Service Data Unit, it and is launched with the 3rd modulation rate after described second header.

7. the method for claim 1, it is characterized in that, described frame pitch is the time cycle from the one group of time cycle that defines in IEEE 802.11 standards, and described one group of time cycle comprises the frame pitch of short frame pitch, priority frame pitch, distributed frame spacing and expansion.

8. the method for claim 1 is characterized in that, described header comprises the physical equipment header.

9. the method for claim 1 is characterized in that, described first modulation rate is in the scope of about 6 to 12 megabits of per second.

10. the method for claim 1 is characterized in that, described second modulation rate is in the scope of about 6 to 240 megabits of per second.

11. a method comprises:

Receive first protocol Data Unit by air interface, described first protocol Data Unit comprises:

First preamble, it makes that receiver can be synchronous, and receives with first modulation rate;

First header, it and receives with described first modulation rate after described first preamble; And

First Service Data Unit, it and receives with second modulation rate after described first header; And

Before ending, frame pitch receives second protocol Data Unit by described air interface.

12. method as claimed in claim 11 is characterized in that, described second protocol Data Unit comprises:

Second preamble, it receives with described first modulation rate;

Second header, it and receives with described first modulation rate after described second preamble; And

Second Service Data Unit, it and receives with the 3rd modulation rate after described second header.

13. method as claimed in claim 12 is characterized in that, described first preamble comprises the total length preamble, and wherein, described second preamble comprises the part preamble.

14. method as claimed in claim 13 is characterized in that, about 2 symbol widths of the described first preamble consumption, and wherein, the about symbol width of the described second preamble consumption.

15. the method for claim 1 is characterized in that, described second protocol Data Unit comprises:

Second header, it receives with described first modulation rate; And

Second Service Data Unit, it and receives with the 3rd modulation rate after described second header.

16. method as claimed in claim 15 is characterized in that, described second header also comprises the data integrity field, and described method also comprises:

Use the information in the described data integrity field to determine whether described second header is effective; And

If described second header is not effectively, then assess the data sementation of at least one header size that receives subsequently, to attempt to find out another possible header.

17. method as claimed in claim 11, it is characterized in that, described frame pitch is from the time cycle in the one group of time cycle that defines in IEEE 802.11 standards, and described one group of time cycle comprises the frame pitch of short frame pitch, priority frame pitch, distributed frame spacing and expansion.

18. method as claimed in claim 11 is characterized in that, described header comprises the physical equipment header.

19. method as claimed in claim 11 is characterized in that, described first modulation rate is in the scope of about 6 to 12 megabits of per second.

20. method as claimed in claim 11 is characterized in that, described second modulation rate is in the scope of about 6 to 240 megabits of per second.

21. a device comprises:

The media interviews control appliance, it can be used for providing the destination to physical equipment is a plurality of data cells of receiver; And

Physical equipment, it is coupled to described media interviews control appliance, and can be used for:

By air interface transmission first protocol Data Unit, wherein said first protocol Data Unit comprises:

First preamble, it makes that receiver can be synchronous, and is that described physical equipment will be launched with first modulation rate;

First header, it and is what described physical equipment will be with the emission of described first modulation rate after described first preamble; And

First Service Data Unit, it and is what described physical equipment will be with second modulation rate emission after described first header; And

Before frame pitch ends by described air interface transmission second protocol Data Unit.

22. device as claimed in claim 21 is characterized in that, described physical equipment also is used in described first protocol Data Unit of emission to be finished to begin to launch described second protocol Data Unit about next symbol boundaries place greatly afterwards.

23. device as claimed in claim 21 is characterized in that, described second protocol Data Unit comprises:

Second preamble, it is that described physical equipment will be with described first modulation rate emission;

Second header, it and is what described physical equipment will be with the emission of described first modulation rate after described second preamble; And

Second Service Data Unit, it and is what described physical equipment will be with the 3rd modulation rate emission after described second header.

24. device as claimed in claim 23 is characterized in that, described first preamble comprises the total length preamble, and wherein, described second preamble comprises the part preamble.

25. device as claimed in claim 24 is characterized in that, the width of about two code elements of the described first preamble consumption, and wherein, the width of the about code element of the described second preamble consumption.

26. device as claimed in claim 21 is characterized in that, described second protocol Data Unit comprises:

Second header, it is that described physical equipment will be with described first modulation rate emission; And

Second Service Data Unit, it and is what described physical equipment will be with the 3rd modulation rate emission after described second header.

27. device as claimed in claim 21, it is characterized in that, described frame pitch is the time cycle from the one group of time cycle that defines in IEEE 802.11 standards, and described one group of time cycle comprises the frame pitch of short time frame pitch, priority frame pitch, distributed frame spacing and expansion.

28. device as claimed in claim 21 is characterized in that, also comprises the one or more antennas that are coupled to described physical equipment, described antenna is used between described air interface and the described physical equipment interface is provided.

29. device as claimed in claim 21 is characterized in that, also comprises the optics transfer equipment that is coupled to described physical equipment, it is used between described air interface and the described physical equipment interface is provided.

30. a device comprises:

The media interviews control appliance, it can be used for receiving a plurality of data cells from physical equipment; And

Physical equipment, it is coupled to described media interviews control appliance, and can be used for:

Receive first protocol Data Unit by air interface, wherein, described first protocol Data Unit comprises:

First preamble, it makes that receiver can be synchronous, and is that described physical equipment will receive with first modulation rate;

First header, it and is that described physical equipment will receive with described first modulation rate after described first preamble; And

First Service Data Unit, it and is that described physical equipment will receive with second modulation rate after described first header; And

Before ending, frame pitch receives second protocol Data Unit by described air interface.

31. device as claimed in claim 30 is characterized in that, described second protocol Data Unit comprises:

Second preamble, it is that described physical equipment will receive with described first modulation rate;

Second header, it and is that described physical equipment will receive with described first modulation rate after described second preamble; And

Second Service Data Unit, it and is that described physical equipment will receive with the 3rd modulation rate after described second header.

32. device as claimed in claim 31 is characterized in that, described first preamble comprises the total length preamble, and described second preamble comprises the part preamble.

33. device as claimed in claim 32 is characterized in that, the width of about two code elements of the described first preamble consumption, and wherein, the width of the about code element of the described second preamble consumption.

34. device as claimed in claim 30 is characterized in that, described second protocol Data Unit comprises:

Second header, it is that described physical equipment will receive with described first modulation rate; And

Second Service Data Unit, it and is that described physical equipment will receive with the 3rd modulation rate after described second header.

35. device as claimed in claim 34 is characterized in that, described second header also comprises the data integrity field, and wherein, described physical equipment also can be used for:

Use the information in the described data integrity field to determine whether described second header is effective;

If described second header is not effectively, then assess the data sementation of at least one header size that receives subsequently, to attempt to find out another possible header.

36. device as claimed in claim 30, it is characterized in that, described frame pitch is the time cycle from the one group of time cycle that defines in IEEE 802.11 standards, and described one group of time cycle comprises the frame pitch of short frame pitch, priority frame pitch, distributed frame spacing and expansion.

37. device as claimed in claim 30 is characterized in that, described header comprises the physical equipment header.

38. device as claimed in claim 30 is characterized in that, also comprises one or more antennas, described antenna is coupled to described physical equipment, and is used between described air interface and the described physical equipment interface is provided.

39. device as claimed in claim 30 is characterized in that, also comprises the optics transfer equipment, it is coupled to described physical equipment, and is used between described air interface and the described physical equipment interface is provided.

40. a computer-readable medium that stores the program command that is used to carry out a kind of method on it when described program command is carried out in WLAN devices, makes:

By air interface transmission first protocol Data Unit, wherein, described first protocol Data Unit comprises:

First preamble, it makes that receiver can be synchronous, and launches with first modulation rate;

First header, it is after described first preamble, and with the emission of described first modulation rate; And

First Service Data Unit, it and is launched with second modulation rate after described first header; And

Before frame pitch ends by described air interface transmission second protocol Data Unit.

41. computer-readable medium as claimed in claim 40 is characterized in that, launches described second protocol Data Unit and begins about next symbol boundaries place greatly after described first protocol Data Unit of emission finishes.

42. computer-readable medium as claimed in claim 40 is characterized in that, described second protocol Data Unit comprises:

Second preamble, it is launched with described first modulation rate;

Second header, it is after described second preamble, and with the emission of described first modulation rate; And

Second Service Data Unit, it and is launched with the 3rd modulation rate after described second header.

43. computer-readable medium as claimed in claim 42 is characterized in that, described first preamble comprises the total length preamble, and wherein, described second preamble comprises the part preamble.

44. computer-readable medium as claimed in claim 43 is characterized in that, the width of about two code elements of the described first preamble consumption, and wherein, the width of the about code element of the described second preamble consumption.

45. computer-readable medium as claimed in claim 40 is characterized in that, described second protocol Data Unit comprises:

Second header, it is launched with described first modulation rate; And

Second Service Data Unit, it and is launched with the 3rd modulation rate after described second header.

46. a computer-readable medium that stores the program command that is used to carry out a kind of method on it when described program command is carried out in WLAN devices, makes:

Receive first protocol Data Unit by air interface, described first protocol Data Unit comprises:

First preamble, it makes that receiver can be synchronous, and receives with first modulation rate;

First header, it and receives with described first modulation rate after described first preamble; And

First Service Data Unit, it and receives with second modulation rate after described first header; And

Before ending, frame pitch receives second protocol Data Unit by described air interface.

47. computer-readable medium as claimed in claim 46 is characterized in that, described second protocol Data Unit comprises:

Second preamble, it receives with described first modulation rate;

Second header, it and receives with described first modulation rate after described second preamble; And

Second Service Data Unit, it and receives with the 3rd modulation rate after described second header.

48. computer-readable medium as claimed in claim 47 is characterized in that, described first preamble comprises the total length preamble, and wherein, described second preamble comprises the part preamble.

49. computer-readable medium as claimed in claim 48 is characterized in that, about 2 symbol widths of the described first preamble consumption, and wherein, the about symbol width of the described second preamble consumption.

50. computer-readable medium as claimed in claim 46 is characterized in that, described second protocol Data Unit comprises:

Second header, it receives with described first modulation rate; And

Second Service Data Unit, it and receives with the 3rd modulation rate after described second header.

51. computer-readable medium as claimed in claim 46 is characterized in that, described second header also comprises the data integrity field, and it is also feasible to carry out described program command:

Use the information in the described data integrity field to determine whether described second header is effective; And

If described second header is not effectively, then assess the data sementation of at least one header size that receives subsequently, to attempt to find out another possible header.

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